Ah, a little more information - this segv only happens when using
password authentication (ssh keys work fine)

sshd_config has
UsePAM yes
PubkeyAuthentication yes
PasswordAuthentication yes
ChallengeResponseAuthentication no

Richard Nelson wrote:
> # /usr/sbin/sshd -Dddd >~/log 2>&1
> Segmentation fault
> 
> The last lines of log:
> debug3: mm_auth_password entering
> debug3: mm_request_send entering: type 11
> debug3: mm_auth_password: waiting for MONITOR_ANS_AUTHPASSWORD
> debug3: mm_request_receive_expect entering: type 12
> debug3: mm_request_receive entering
> debug3: monitor_read: checking request 11
> debug1: do_cleanup
> debug1: PAM: cleanup
> debug3: PAM: sshpam_thread_cleanup entering
> 
> gdb isn't very helpful
> Program received signal SIGSEGV, Segmentation fault.
> 0x00002acda6fe7af2 in ?? ()
> (gdb) bt
> #0  0x00002acda6fe7af2 in ?? ()
> #1  0x00002acda692ad86 in ?? ()
> #2  0x0000000000000050 in ?? ()
> #3  0x0000000000000001 in ?? ()
> #4  0x00007fff05c7cf10 in ?? ()
> #5  0x0000000000000000 in ?? ()
> (gdb) quit
> The program is running.  Exit anyway? (y or n) y
> debug1: do_cleanup
> debug1: PAM: cleanup
> debug3: PAM: sshpam_thread_cleanup entering
> 
> I installed libpam-dbg, but still didn't get any information
> 
> removing pam_krb5 from /etc/pam.d/common-auth fixes the problem
> 




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